/*
* jQuery UI Nested Sortable
* v 1.3.5 / 21 jun 2012
* http://mjsarfatti.com/code/nestedSortable
*
* Depends on:
*         jquery.ui.sortable.js 1.8+
*
* Copyright (c) 2010-2012 Manuele J Sarfatti
* Licensed under the MIT License
* http://www.opensource.org/licenses/mit-license.php
*/

(function($) {

        $.widget("mjs.nestedSortable", $.extend({}, $.ui.sortable.prototype, {

                options: {
                        tabSize: 20,
                        disableNesting: 'mjs-nestedSortable-no-nesting',
                        errorClass: 'mjs-nestedSortable-error',
                        doNotClear: false,
                        listType: 'ol',
                        maxLevels: 0,
                        protectRoot: false,
                        rootID: null,
                        rtl: false,
                        isAllowed: function(item, parent) { return true; }
                },

                _create: function() {
                        this.element.data('sortable', this.element.data('nestedSortable'));

                        if (!this.element.is(this.options.listType))
                                throw new Error('nestedSortable: Please check the listType option is set to your actual list type');

                        return $.ui.sortable.prototype._create.apply(this, arguments);
                },

                destroy: function() {
                        this.element
                                .removeData("nestedSortable")
                                .unbind(".nestedSortable");
                        return $.ui.sortable.prototype.destroy.apply(this, arguments);
                },

                _mouseDrag: function(event) {

                        //Compute the helpers position
                        this.position = this._generatePosition(event);
                        this.positionAbs = this._convertPositionTo("absolute");

                        if (!this.lastPositionAbs) {
                                this.lastPositionAbs = this.positionAbs;
                        }

                        var o = this.options;

                        //Do scrolling
                        if(this.options.scroll) {
                                var scrolled = false;
                                if(this.scrollParent[0] != document && this.scrollParent[0].tagName != 'HTML') {

                                        if((this.overflowOffset.top + this.scrollParent[0].offsetHeight) - event.pageY < o.scrollSensitivity)
                                                this.scrollParent[0].scrollTop = scrolled = this.scrollParent[0].scrollTop + o.scrollSpeed;
                                        else if(event.pageY - this.overflowOffset.top < o.scrollSensitivity)
                                                this.scrollParent[0].scrollTop = scrolled = this.scrollParent[0].scrollTop - o.scrollSpeed;

                                        if((this.overflowOffset.left + this.scrollParent[0].offsetWidth) - event.pageX < o.scrollSensitivity)
                                                this.scrollParent[0].scrollLeft = scrolled = this.scrollParent[0].scrollLeft + o.scrollSpeed;
                                        else if(event.pageX - this.overflowOffset.left < o.scrollSensitivity)
                                                this.scrollParent[0].scrollLeft = scrolled = this.scrollParent[0].scrollLeft - o.scrollSpeed;

                                } else {

                                        if(event.pageY - $(document).scrollTop() < o.scrollSensitivity)
                                                scrolled = $(document).scrollTop($(document).scrollTop() - o.scrollSpeed);
                                        else if($(window).height() - (event.pageY - $(document).scrollTop()) < o.scrollSensitivity)
                                                scrolled = $(document).scrollTop($(document).scrollTop() + o.scrollSpeed);

                                        if(event.pageX - $(document).scrollLeft() < o.scrollSensitivity)
                                                scrolled = $(document).scrollLeft($(document).scrollLeft() - o.scrollSpeed);
                                        else if($(window).width() - (event.pageX - $(document).scrollLeft()) < o.scrollSensitivity)
                                                scrolled = $(document).scrollLeft($(document).scrollLeft() + o.scrollSpeed);

                                }

                                if(scrolled !== false && $.ui.ddmanager && !o.dropBehaviour)
                                        $.ui.ddmanager.prepareOffsets(this, event);
                        }

                        //Regenerate the absolute position used for position checks
                        this.positionAbs = this._convertPositionTo("absolute");

      // Find the top offset before rearrangement,
      var previousTopOffset = this.placeholder.offset().top;

                        //Set the helper position
                        if(!this.options.axis || this.options.axis != "y") this.helper[0].style.left = this.position.left+'px';
                        if(!this.options.axis || this.options.axis != "x") this.helper[0].style.top = this.position.top+'px';

                        //Rearrange
                        for (var i = this.items.length - 1; i >= 0; i--) {

                                //Cache variables and intersection, continue if no intersection
                                var item = this.items[i], itemElement = item.item[0], intersection = this._intersectsWithPointer(item);
                                if (!intersection) continue;

                                if(itemElement != this.currentItem[0] //cannot intersect with itself
                                        &&        this.placeholder[intersection == 1 ? "next" : "prev"]()[0] != itemElement //no useless actions that have been done before
                                        &&        !$.contains(this.placeholder[0], itemElement) //no action if the item moved is the parent of the item checked
                                        && (this.options.type == 'semi-dynamic' ? !$.contains(this.element[0], itemElement) : true)
                                        //&& itemElement.parentNode == this.placeholder[0].parentNode // only rearrange items within the same container
                                ) {

                                        $(itemElement).mouseenter();

                                        this.direction = intersection == 1 ? "down" : "up";

                                        if (this.options.tolerance == "pointer" || this._intersectsWithSides(item)) {
                                                $(itemElement).mouseleave();
                                                this._rearrange(event, item);
                                        } else {
                                                break;
                                        }

                                        // Clear emtpy ul's/ol's
                                        this._clearEmpty(itemElement);

                                        this._trigger("change", event, this._uiHash());
                                        break;
                                }
                        }

                        var parentItem = (this.placeholder[0].parentNode.parentNode &&
                                                         $(this.placeholder[0].parentNode.parentNode).closest('.ui-sortable').length)
                                                         ? $(this.placeholder[0].parentNode.parentNode)
                                                         : null,
                         level = this._getLevel(this.placeholder),
                         childLevels = this._getChildLevels(this.helper);

      // To find the previous sibling in the list, keep backtracking until we hit a valid list item.
                        var previousItem = this.placeholder[0].previousSibling ? $(this.placeholder[0].previousSibling) : null;
                        if (previousItem != null) {
                                while (previousItem[0].nodeName.toLowerCase() != 'li' || previousItem[0] == this.currentItem[0] || previousItem[0] == this.helper[0]) {
                                        if (previousItem[0].previousSibling) {
                                                previousItem = $(previousItem[0].previousSibling);
                                        } else {
                                                previousItem = null;
                                                break;
                                        }
                                }
                        }

      // To find the next sibling in the list, keep stepping forward until we hit a valid list item.
      var nextItem = this.placeholder[0].nextSibling ? $(this.placeholder[0].nextSibling) : null;
      if (nextItem != null) {
        while (nextItem[0].nodeName.toLowerCase() != 'li' || nextItem[0] == this.currentItem[0] || nextItem[0] == this.helper[0]) {
          if (nextItem[0].nextSibling) {
            nextItem = $(nextItem[0].nextSibling);
          } else {
            nextItem = null;
            break;
          }
        }
      }

                        var newList = document.createElement(o.listType);

                        this.beyondMaxLevels = 0;

                        // If the item is moved to the left, send it to its parent's level unless there are siblings below it.
                        if (parentItem != null && nextItem == null &&
                                        (o.rtl && (this.positionAbs.left + this.helper.outerWidth() > parentItem.offset().left + parentItem.outerWidth()) ||
                                        !o.rtl && (this.positionAbs.left < parentItem.offset().left))) {
                                parentItem.after(this.placeholder[0]);
                                this._clearEmpty(parentItem[0]);
                                this._trigger("change", event, this._uiHash());
                        }
                        // If the item is below a sibling and is moved to the right, make it a child of that sibling.
                        else if (previousItem != null &&
                                                (o.rtl && (this.positionAbs.left + this.helper.outerWidth() < previousItem.offset().left + previousItem.outerWidth() - o.tabSize) ||
                                                !o.rtl && (this.positionAbs.left > previousItem.offset().left + o.tabSize))) {
                                this._isAllowed(previousItem, level, level+childLevels+1);
                                if (!previousItem.children(o.listType).length) {
                                        previousItem[0].appendChild(newList);
                                }
        // If this item is being moved from the top, add it to the top of the list.
        if (previousTopOffset && (previousTopOffset <= previousItem.offset().top)) {
          previousItem.children(o.listType).prepend(this.placeholder);
        }
        // Otherwise, add it to the bottom of the list.
        else {
                                 previousItem.children(o.listType)[0].appendChild(this.placeholder[0]);
        }
                                this._trigger("change", event, this._uiHash());
                        }
                        else {
                                this._isAllowed(parentItem, level, level+childLevels);
                        }

                        //Post events to containers
                        this._contactContainers(event);

                        //Interconnect with droppables
                        if($.ui.ddmanager) $.ui.ddmanager.drag(this, event);

                        //Call callbacks
                        this._trigger('sort', event, this._uiHash());

                        this.lastPositionAbs = this.positionAbs;
                        return false;

                },

                _mouseStop: function(event, noPropagation) {

                        // If the item is in a position not allowed, send it back
                        if (this.beyondMaxLevels) {

                                this.placeholder.removeClass(this.options.errorClass);

                                if (this.domPosition.prev) {
                                        $(this.domPosition.prev).after(this.placeholder);
                                } else {
                                        $(this.domPosition.parent).prepend(this.placeholder);
                                }

                                this._trigger("revert", event, this._uiHash());

                        }

                        // Clean last empty ul/ol
                        for (var i = this.items.length - 1; i >= 0; i--) {
                                var item = this.items[i].item[0];
                                this._clearEmpty(item);
                        }

                        $.ui.sortable.prototype._mouseStop.apply(this, arguments);

                },

                serialize: function(options) {

                        var o = $.extend({}, this.options, options),
                                items = this._getItemsAsjQuery(o && o.connected),
                         str = [];

                        $(items).each(function() {
                                var res = ($(o.item || this).attr(o.attribute || 'id') || '')
                                                .match(o.expression || (/(.+)[-=_](.+)/)),
                                 pid = ($(o.item || this).parent(o.listType)
                                                .parent(o.items)
                                                .attr(o.attribute || 'id') || '')
                                                .match(o.expression || (/(.+)[-=_](.+)/));

                                if (res) {
                                        str.push(((o.key || res[1]) + '[' + (o.key && o.expression ? res[1] : res[2]) + ']')
                                                + '='
                                                + (pid ? (o.key && o.expression ? pid[1] : pid[2]) : o.rootID));
                                }
                        });

                        if(!str.length && o.key) {
                                str.push(o.key + '=');
                        }

                        return str.join('&');

                },

                toHierarchy: function(options) {

                        var o = $.extend({}, this.options, options),
                                sDepth = o.startDepthCount || 0,
                         ret = [];

                        $(this.element).children(o.items).each(function () {
                                var level = _recursiveItems(this);
                                ret.push(level);
                        });

                        return ret;

                        function _recursiveItems(item) {
                                var id = ($(item).attr(o.attribute || 'id') || '').match(o.expression || (/(.+)[-=_](.+)/));
                                if (id) {
                                        var currentItem = {"id" : id[2]};
                                        if ($(item).children(o.listType).children(o.items).length > 0) {
                                                currentItem.children = [];
                                                $(item).children(o.listType).children(o.items).each(function() {
                                                        var level = _recursiveItems(this);
                                                        currentItem.children.push(level);
                                                });
                                        }
                                        return currentItem;
                                }
                        }
                },

                toArray: function(options) {

                        var o = $.extend({}, this.options, options),
                                sDepth = o.startDepthCount || 0,
                         ret = [],
                         left = 2;

                        ret.push({
                                "item_id": o.rootID,
                                "parent_id": 'none',
                                "depth": sDepth,
                                "left": '1',
                                "right": ($(o.items, this.element).length + 1) * 2
                        });

                        $(this.element).children(o.items).each(function () {
                                left = _recursiveArray(this, sDepth + 1, left);
                        });

                        ret = ret.sort(function(a,b){ return (a.left - b.left); });

                        return ret;

                        function _recursiveArray(item, depth, left) {

                                var right = left + 1,
                                 id,
                                 pid;

                                if ($(item).children(o.listType).children(o.items).length > 0) {
                                        depth ++;
                                        $(item).children(o.listType).children(o.items).each(function () {
                                                right = _recursiveArray($(this), depth, right);
                                        });
                                        depth --;
                                }

                                id = ($(item).attr(o.attribute || 'id')).match(o.expression || (/(.+)[-=_](.+)/));

                                if (depth === sDepth + 1) {
                                        pid = o.rootID;
                                } else {
                                        var parentItem = ($(item).parent(o.listType)
                                                                                         .parent(o.items)
                                                                                         .attr(o.attribute || 'id'))
                                                                                         .match(o.expression || (/(.+)[-=_](.+)/));
                                        pid = parentItem[2];
                                }

                                if (id) {
                                                ret.push({"item_id": id[2], "parent_id": pid, "depth": depth, "left": left, "right": right});
                                }

                                left = right + 1;
                                return left;
                        }

                },

                _clearEmpty: function(item) {

                        var emptyList = $(item).children(this.options.listType);
                        if (emptyList.length && !emptyList.children().length && !this.options.doNotClear) {
                                emptyList.remove();
                        }

                },

                _getLevel: function(item) {

                        var level = 1;

                        if (this.options.listType) {
                                var list = item.closest(this.options.listType);
                                while (list && list.length > 0 &&
                            !list.is('.ui-sortable')) {
                                        level++;
                                        list = list.parent().closest(this.options.listType);
                                }
                        }

                        return level;
                },

                _getChildLevels: function(parent, depth) {
                        var self = this,
                         o = this.options,
                         result = 0;
                        depth = depth || 0;

                        $(parent).children(o.listType).children(o.items).each(function (index, child) {
                                        result = Math.max(self._getChildLevels(child, depth + 1), result);
                        });

                        return depth ? result + 1 : result;
                },

                _isAllowed: function(parentItem, level, levels) {
                        var o = this.options,
                                isRoot = $(this.domPosition.parent).hasClass('ui-sortable') ? true : false,
                                maxLevels = this.placeholder.closest('.ui-sortable').nestedSortable('option', 'maxLevels'); // this takes into account the maxLevels set to the recipient list

                        // Is the root protected?
                        // Are we trying to nest under a no-nest?
                        // Are we nesting too deep?
                        if (!o.isAllowed(this.currentItem, parentItem) ||
                                parentItem && parentItem.hasClass(o.disableNesting) ||
                                o.protectRoot && (parentItem == null && !isRoot || isRoot && level > 1)) {
                                        this.placeholder.addClass(o.errorClass);
                                        if (maxLevels < levels && maxLevels != 0) {
                                                this.beyondMaxLevels = levels - maxLevels;
                                        } else {
                                                this.beyondMaxLevels = 1;
                                        }
                        } else {
                                if (maxLevels < levels && maxLevels != 0) {
                                        this.placeholder.addClass(o.errorClass);
                                        this.beyondMaxLevels = levels - maxLevels;
                                } else {
                                        this.placeholder.removeClass(o.errorClass);
                                        this.beyondMaxLevels = 0;
                                }
                        }
                }

        }));

        $.mjs.nestedSortable.prototype.options = $.extend({}, $.ui.sortable.prototype.options, $.mjs.nestedSortable.prototype.options);
})(jQuery);